Not working with folder other than wp-content?

i can’t get this plugin working an a fresh wp 3.6.1 install! but i do have changed the name of the wp-content folder to main, and i think there are some ocurrences of wp-content hard-coded, can you verify this please? (eg. in WPSupersized.php)

i’m just getting the circle, no images, here is the debugging info from the page source: